Oil-soluble ionic liquids as antiwear and extreme pressure additives in poly-α-olefin for steel/steel contacts

Guowei HUANG; Qiangliang YU; Zhengfeng MA; Meirong CAI; Feng ZHOU; Weimin LIU

doi:10.1007/s40544-017-0180-8

Friction 2019, 7(1): 18-31 https://doi.org/10.1007/s40544-017-0180-8

Research Article |

Open Access | Issue | Published: 29 December 2017

Oil-soluble ionic liquids as antiwear and extreme pressure additives in poly-α-olefin for steel/steel contacts

Show Author's Information Hide Author's Information Guowei HUANG^{¹^,²}, Qiangliang YU^¹, Zhengfeng MA^¹, Meirong CAI^¹(

), Feng ZHOU^¹(

), Weimin LIU^¹

¹ State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China

² University of Chinese Academy of Sciences, Beijing 100049, China

Keywords:

lubricating mechanism, anti-wear, extreme pressure, ionic liquids

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HUANG G, YU Q, MA Z, et al. Oil-soluble ionic liquids as antiwear and extreme pressure additives in poly-α-olefin for steel/steel contacts. Friction, 2019, 7(1): 18-31. https://doi.org/10.1007/s40544-017-0180-8

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Abstract

To enhance the lubricating and extreme pressure (EP) performance of base oils, two types of oil-soluble ionic liquids (ILs) with similar anion albeit dissimilar cations were synthesized. The physical properties of the prepared ILs were measured. The anticorrosion properties of ILs were assessed by conducting corrosion tests on steel discs and copper strips, which revealed the remarkable anticorrosion properties of the ILs in comparison with those of the commercial additive zinc dialkyldithiophosphate (ZDDP). The tribological properties of the two ILs as additives for poly-α-olefin-10 (PAO10) with various mass concentrations were investigated. The tribological test results indicate that these ILs as additives are capable of reducing friction and wear of sliding contacts remarkably as well as enhance the EP performance of blank PAO10. Under similar test conditions, these IL additives exhibit higher lubricating and anti-wear (AW) performances than those of ZDDP based additive package in PAO10. Subsequently, X-ray photoelectron spectroscopy (XPS) and energy dispersive spectrometer (EDS) were conducted to study the lubricating mechanism of the two ILs. The results indicate that the formation of tribochemical film plays the most crucial role in enhancing the lubricating and AW behavior of the mixture lubricants.

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Oil-soluble ionic liquids as antiwear and extreme pressure additives in poly-α-olefin for steel/steel contacts

Show Author's information Hide Author's Information Guowei HUANG^{¹^,²}, Qiangliang YU^¹, Zhengfeng MA^¹, Meirong CAI^¹(

), Feng ZHOU^¹(

), Weimin LIU^¹

¹ State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China

² University of Chinese Academy of Sciences, Beijing 100049, China

Abstract

Keywords: lubricating mechanism, anti-wear, extreme pressure, ionic liquids

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Publication history

Received: 01 April 2017

Revised: 13 June 2017

Accepted: 01 July 2017

Published: 29 December 2017

Issue date: February 2019

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Acknowledgements

The authors acknowledge the financial support from the National Natural Science Foundation of China (NSFC, Nos. 51675512, 51227804, and 51305428), Natural Science Foundation of Gansu Province (No. 1606RJZA051), and the National Key Basic Research and Development (973) Program of China (No. 2013CB632301).

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